LOAD_DAMPING

Loads

Parameter definition

ID of a CURVE or FUNCTION defining the mass damping coefficient $C$ versus time

$\mu$

Viscous damping coefficient

$c_{dec}$

Viscous decay coefficient

Description

This command is used to define mass damping and viscous damping for a given subset of the model.
The mass damping force $\mathbf{F}_i$ acting a node $i$ is defined as:

$\mathbf{F}_i = -C \cdot m_i \cdot \mathbf{v}_i$

where $C$ is the damping coefficient defined by the CURVE or FUNCTION with ID cid,
$m_i$ is the node mass and $\mathbf{v}_i$ is the node velocity.
The viscous damping is defined as an artificial material viscosity.
This viscosity produces an extra, strain rate dependent, stress term $\mathbf{\sigma}_\mu$: